中国塑料 ›› 2025, Vol. 39 ›› Issue (8): 26-33.DOI: 10.19491/j.issn.1001-9278.2025.08.005

• 材料与性能 • 上一篇    下一篇

超支化聚己内酯对聚乳酸/滑石粉共混体系的增韧改性研究

张雨森1, 帖锐1, 李紫鸣1, 廖保胜1, 郭润奇1, 靳玉娟1(), 张哲1, 蒋苏臣1,2   

  1. 1.北京工商大学轻工科学与工程学院,北京 100048
    2.扬州惠通新材料有限公司,江苏 扬州 225000
  • 收稿日期:2024-09-05 出版日期:2025-08-26 发布日期:2025-07-30
  • 通讯作者: 靳玉娟(1983—),女,教授,从事生物与降解高分子材料的改性研究,jinyujuan@th.btbu.edu.cn
    E-mail:jinyujuan@th.btbu.edu.cn

Study of toughening modification of poly(lactic acid)/talc blends with hyperbranched polycaprolactone

ZHANG Yusen1, TIE Rui1, LI Ziming1, LIAO Baosheng1, GUO Runqi1, JIN Yujuan1(), ZHANG Zhe1, JIANG Suchen1,2   

  1. 1.College of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China
    2.Yangzhou Huitong New Material Co,Ltd,Yangzhou 225000,China
  • Received:2024-09-05 Online:2025-08-26 Published:2025-07-30
  • Contact: JIN Yujuan E-mail:jinyujuan@th.btbu.edu.cn

摘要:

以己内酯(ε⁃CL)为原料,2,2⁃双羟甲基丙酸(DMPA)为引发剂,辛酸亚锡为催化剂,使用开环⁃缩聚法合成超支化聚己内酯(HPCL),并对产物进行表征。将HPCL作为改性剂添加到聚乳酸/滑石粉(PLA/Talc)共混体系中,并对PLA/滑石粉/HPCL共混体系进行红外、扫描电子显微镜(SEM)、热性能、力学和熔体流动速率测试。结果表明,PLA/滑石粉/HPCL的结晶度随着HPCL含量的增加先增大后减小,当HPCL添加量为4份时,结晶度达到最大值25.14 %; HPCL的加入改善PLA/滑石粉共混体系的流动性,当HPCL添加量为7份时,其熔体流动速率相比PLA/滑石粉共混体系提升了74.6 %; 此外,HPCL的加入可以对PLA/滑石粉共混体系起到增韧作用,当HPCL含量为7份时,其断裂伸长率较PLA/滑石粉提升了65.27 %,冲击强度提升了80.28 %。

关键词: 超支化聚己内酯, 聚乳酸, 结晶度, 增韧

Abstract:

Hyperbranched polycaprolactone (HPCL) was synthesized via ring⁃opening condensation polymerization of ε⁃caprolactone using 2,2⁃dihydroxymethylpropionic acid as the initiator and stannous octoate as the catalyst. The synthesized HPCL was characterized and subsequently incorporated into a poly(lactic acid) (PLA)/talc blend. The PLA/talc/HPCL blends were systematically evaluated using infrared spectroscopy, morphological analysis, thermal analysis, mechanical testing, and melt flow rate measurements. Results demonstrated a non⁃monotonic relationship between HPCL content and crystallinity, with the maximum crystallinity (25.14%) achieved at 4 phr HPCL loading. The HPCL addition significantly enhanced the blend's processability, exhibiting a 74.6% improvement in melt flow rate at 7 phr HPCL loading compared to the unmodified PLA/talc blend. Notably, the HPCL modification substantially improved the blend's toughness. With 7 phr HPCL, the blends revealed an increase in elongation at break by 65.27% and impact strength by 80.28% relative to the baseline PLA/talc system. These findings demonstrate HPCL's effectiveness as a multifunctional modifier for simultaneously enhancing the crystallinity, processability, and mechanical properties of PLA/talc blends.

Key words: hyperbranched polycaprolactone, poly(lactic acid), crystallinity, toughening

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